Dear All, I'm performing a (mechanical) calculation using the eigs and I've been noticing that the results are strongly sensitive on the unit system I'm using; I can understand that high numbers can lead to some numerical "issues" ...
Is there a way to increase the accuracy ? Paul PS: the 2 types of results NB: 1 (MPa) = 1E6 (Pa) 1 (mm) = 1E-3 (m) 1 (Kg/m^3) = 1E12 (T/mm^3) [u,v] = eigs(K((ddl_elem+1):$,(ddl_elem+1):$),M((ddl_elem+1):$,(ddl_elem+1):$),n,"SM"); a) calculation 1 in Pa, m, Kg/m^3 Natural frequency calculation: - Resonance 1 : 497.956 Hz - Resonance 2 : 3120.64 Hz - Resonance 3 : 5277.8 Hz - Resonance 4 : 6948.69 Hz - Resonance 5 : 8737.88 Hz - Resonance 6 : 15832.1 Hz - Resonance 7 : 17122.8 Hz - Resonance 8 : 20847.8 Hz - Resonance 9 : 26382.5 Hz - Resonance 10 : 28305.1 Hz - Resonance 11 : 34752 Hz - Resonance 12 : 36926.4 Hz b) Calculation in MPa, mm, T/mm^3 .... Natural frequency calculation: - Resonance 1 : 497.955 Hz - Resonance 2 : 497.956 Hz - Resonance 3 : 3120.59 Hz - Resonance 4 : 3120.64 Hz - Resonance 5 : 6948.69 Hz - Resonance 6 : 7463.93 Hz - Resonance 7 : 8737.56 Hz - Resonance 8 : 8737.88 Hz - Resonance 9 : 17121.6 Hz - Resonance 10 : 17122.8 Hz - Resonance 11 : 20847.8 Hz - Resonance 12 : 22390 Hz EXPORT CONTROL : Cet email ne contient pas de données techniques This email does not contain technical data
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